Giving credit to Roy Thomas for his contribution is not taking it away from Len Wein, it's just adding to the mix.  Failure is an orphan, but "Success has many fathers"--and sometimes it takes 4 or 5 or more people to collectively create something as popular and beloved and unique as Wolverine.

Put it this way. Earlier in this thread, people having been levelling an accusation against Thomas that he waited until everyone involved was dead to make these claims.

Whatever little weight you might want to give to that article, at the very least it proves that isn't the case.

Personally, I think it counts for little. Taking an animal's name and saying it could be a superhero name is, as Thomas himself says in one of those interviews, a trivial thing.

The claws; the healing power; the costume; the attitude -- these are the main things that constitute Wolverine. It tends to lean heavily in favour of Len Wein and John Romita as the creators.

But it is indeed the case.

The formal claim is happening now, when everyone else involved is indeed dead.

And nobody "impartial" saw those articles & interviews and said: "Wow, Roy Thomas should get credit on Wolverine". It's an editor's job, nothing more.

Wait 50 years and then try to unmix the paint.

Marvel used the contest to swipe ideas from children 

Roy Thomas is getting credit why not him?

Nope.  After Silver Spider failed to sell to Harvey, Simon and Kirby reworked the idea into "Spiderman."  Simon created a prototype logo, but apparently not much else (if anything) was done with it.  The logo still survives (it is pictured in this article).  

Did Stan independently come up with the name Spider-Man, or did Kirby mention the name from this earlier project to him?  We will never know for certain (which is why I said Stan "may have gotten the name" from Simon and Kirby).  Given the similarities between the Silver Spider story and Ditko's report of the rejected original Spider-Man story, I lean towards believing that Kirby did contribute the name.  But as noted, we can't say for sure.

The important point is that the name doesn't really matter that much.  What matters is what was done to flesh out and elaborate the name into an actual character, and that work was done by Lee and Ditko, who are rightly credited as Spider-Man's creators.  Although it is worth noting that Stan himself generally advocated for the opposite position, asserting that the the person who comes up with the initial idea is the sole creator, regardless of how sparse the original idea might be and regardless of how much is added by those who flesh out that idea.